boar vs warthog

boar

noun
  • A wild boar (Sus scrofa), the wild ancestor of the domesticated pig. 

  • A male bear. 

  • A male pig. 

  • A male boar (sense 1). 

  • A male guinea pig. 

warthog

noun
  • A wild pig of the genus Phacochoerus, native to Africa. 

  • A nickname for the A-10 Thunderbolt II air support warplane 

How often have the words boar and warthog occurred in a corpus of books? (source: Google Ngram Viewer )